I wrote Canon vs Pentax lenses at my blog a while ago, probably this will be helpful for you to check out what Pentax has available especially in high-pro grade prime and pro grade zoom area.

I have read your blog,the comparisson is very good,minus 2 things:
1.The Pentax 50-200mm IQ 7 ? That lens is mediocre compared to other 50-200mm lenses out there. It deserve a 4,or 5 at best.
2. The 16-50mm F/2.8 also has a higher quality rating that it should deserve. The optics are really not impressive.